On the Scantron answer sheet, completely blacken the bubble (using a number 2 pe

Question

On the Scantron answer sheet, completely blacken the bubble (using a number 2 pencil) in the "test form" field indicating that this is test form A. Then, indicate your responses by filling in the bubble corresponding to the one lettered item that best answers each question or completes each statement. Arising from bed causes blood to pool in the legs resulting in a rapid drop in blood pressure. This is sensed by arterial pressure receptors, which convey the information to the medulla (brain). Neural output from the medulla causes an increase in heart rate and constriction of blood vessels, thereby restoring blood pressure to normal. In this negative-feedback control system, which of the following is termed the integrator? A heart B blood vessels C medulla D arterial pressure receptors Regarding open-loop physiological systems, which of the following statements is TRUE? A They are far more common than negative-feedback control systems. B They can occur pathologically when part of a negative-feedback system ceases to function. C They respond to an increase in a controlled variable by producing a further increase in the variable. D) They respond to an increase in a controlled variable by producing a decrease in the variable. Regarding membrane phospholipids, which of the following statements is FALSE? A They are fluid and readily diffuse laterally in the membrane, but rarely flip from one side of the bilayer to the other side. B The hydrocarbon tails in the center of the membrane do not significantly hinder the transmembrane flow of polar (hydrophilic) solutes.

Explanation / Answer

1 ) here the answer is arterial pressure receptors ( baroreceptors ) in the heart .These receptors are connected to a control center that integrates the information fed to it by the receptors. In most homeostatic mechanisms, the control center is the brain. When the brain receives information about a change or deviation in the body's internal conditions, it sends out signals along nerves. These signals prompt the changes in function that correct the deviation and bring the internal conditions back to the normal range.

2 ) answer is B

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